Azo dyestuffs containing chromium and process of making same



Patented May 9, 1933 UNITED s r'rss team FRITZ STRAUB AND HANSMAYER, OF BASEL, SWITZERLAND, AS SIGNIORS TO THE FIRM OF SOCIETY OF CHEMICAL INDUSTRY IN BASLE, OF BASEL, SWITZERLAND AZO DYESTUFFS CONTAINING CHROMIUIJK AND PROQESSFOIF IVIAKING- SAME N Drawing Application filed November 28, 1330, Serial No, 498,904, and in Switzerlandiliecember 18,

'N=Nbridge at leastone hydroxylor carboxyl-group, i. e. such a group which, in combination with an a zo-br1dge, renders the dyestuff capable of binding chromium, and

- also those which contain at least once the grouping ortho-hydroxy-carboxyl, such as is characteristic of the salicylic acid derivatives.

The process can be carried outboth with poly-azo-dyestufis and with mono-aZo-dyestuffs of the general formula R1N=NR2 wherein R represents an aryl radicle, such as Ii for example abenzene or naphthalene radicle,

R a radicle of a coupling" component, and m such a group standing in ortho-position to the N=Nbridge, which, in combination with this N=Nbridge, renders the dyet stuff capable of binding chromium.

As coupling components there may be used all those which come into consideration for the production of azo-dyestufi's, such for example as arylamines, phenols, as also com- 3 pounds of which the carbon atom capable of coupling belongs to a heterocyclic ring or to an open chain. The former is for example the case with pyrazolones, bydroxyquinolines and barbituric acids, the latter for instance with the acetoacetic acid derivatives and the benzoyl-aceto-o-carboxylicacids.

The invention leads to a process which is cheaper in operation than when the known chroming methods are used, in case of which by the use'of chromiumsalts of inor'ganic" acids a complete chromation can only be effected by adding an acid binding agent, such as for example sodium acetate, which is rendering the process more expensive.

The products which can be obtained are suitable, for example, for dyeing 'animal obtained from diazotized 4-nitro-2-amino-1- phenol-G-sulfonicacid andJaceto-acetic acid anilide are dissolved in 1500 parts'of' water. The solution is heated to boiling and then boiled for hours in a reflux apparatus with addition of 72 parts of a solution of chromium sulfate containing 8.4: parts of C130 and 16.1 parts of sulfuric acid. By this operation the chromium compound produced is in greater part precipitated and the remainder separates on cooling. The compound is filtered "and dried at a moderate temperature. This dyestuff is abrown yellow powder which dissolvessomewhat sparingly in water but, easily onaddition of some 'sodium' carbonate. In a bath containing sulfuric acid it dyes wool fast yellow tints.

From the dyestuff of the formula Ho3s N=NC.CCH5

Ito-h -N obtained from di'azotized 4 nitrb-2-amino-lphenol 6 sulfonic acid and 1 phenyl 3 methyl-5-pyrazolone there is obtained in like manner a chromium compound which dyes wool in a bath containing sulfuric'aoid fast 5 yellowish orange tints.

Example. 2

parts of the dyestufi' .ofthe formula N=N-OCOH: OH HO("J obtained from diazotized l-amino-Q-hydroxynaphthalene-4-sulfonic acid and l-(metasulfamido phenyl) 3 methyl 5 pyrazolone are dissolved in 1500, parts of boiling water and the solution is boiled for 20 hours in a Y reflux apparatus, with addition of a quantity of a chromium sulfate solution corresponding with 8.4 parts of C130 and 16.1 parts of sulfuric acid. The chromium compound separates in crystalline condition. It is reg moved from the liquor and when dry is a brown red powder, which dissolves sparingly in water and freely in hot sodium car bonate solution to a bluish-red solution. It dyes wool in a bath containing sulfuric acid fast rose tints.

l J From the dyestuff of the formula V N=N- o- 0- cm OH O & 1% V 9 v ,N 02- I \N/ I I I p s 03H somm obtained from nitrated 1dl2LZO2hydI0X-' ynaphthalene-4-sulfonic acid and l-(metasulfaminophenyl) -3 methyl 5 pyrazolone r there is obtained in analo ous manner the chromium compound whic dyes yellowish red, and from the dyestufl' of the formula Example 3 A mixture of 45.4 parts of the dyestufi' of the formula HOaS obtained from diazotized 2-amino-1-phenol- 4: G-disulfonic acid and 1-phenyl-3-methyl-5- pyrazolone, 72 parts of a neutral chromium sulfate solution, containing 11.7 parts of Cr O and 500 parts of water, is boiled and kept boiling for 15 hours. It is then made feebly alkaline with sodium carbonate, filtered from some chromium hydroxide which has separated and the filtrate containing the dyestuif'is evaporated to dryness in a vac uum. The chromium compound thus formed is very easily soluble in water and dyes Wool in a bath containing sulfuric acid very level orange tints.

In like manner there is obtained, for eXample, from the dyestuff of the formula obtained from diazotized 1amino-2-hydroxynaphthalene-4-sulfonic acid and 1- (meta-sulfophenyl) -'3-methyl-5-pyrazolone a freely soluble chromium compound which dyes rose tints.

Ewavaple 4 47.4 parts of the dyestufi' of the formula HOaS OH pound thus obtained is a blue powder easily soluble in'water and dyeing wool in a bath containing sulfuric acid reddish blue tints.

In this case the basicity of the chromium sulfate may be varied Within wide limits without preventing the formation of the blue chromium compound. Even in the absence of free sulfuric acid, for instance by using an acid chromium sulfate containing 1 molecular proportion of ,Cr O to 1 molecular proportions of sulfuric acid, the chroming proceeds smoothly and leads to the same chromium compound.

Example 5 89.4 parts of the dyestuif of the formula l n from. diazotized 1-amino-2-hydroxynaphthalenel-sulfonic acid and otnaphthol are dissolved in 2000 parts of boiling water. Then the solution is heated to boiling for 24 hours with addition of 15.2 parts of Cr O in the form of chromium sulfate containing one molecular proportion of C150 to 2 molecular proportions of sulfuric acid; the chromium compound formed is then salted out, filtered and dried at a modcrate temperature. It is somewhat sparingly soluble in water to a greenish blue solution and in sodium carbonate solution to a reddish-blue solution. It dyes wool in a bath containing mineral acid fast greenish blue tints.

Instead of the aforesaid dyestuff made from a-naphthol, the corresponding product from ,B-naphthol may be used and also a somewhat more basic chromium sulfate (for instance 1CI'203+2H2SO4) in this case also a chromium compound dyeing reddish blue is obtained.

Emample 6 A mixture of 45.2 partsof the dyestuff of the formula obtained from diazotized Q-aminO-l-phenol- 7 sulfuric acid fast reddish orange tints.

Emcmnple '7 I 38.8 parts of the dyestuff of the formula on Q obtained I from diazotized 5-nitro-2-amino-1- phenol and 2-naphthyl-amine 6 sulfonic acid are dissolved in 1500 parts of water and the solution is heated for 10 hours in an enamelledautoclave having a stirrer to 115- 120 C. with addition of a quantity of a chromium sulfate solution corresponding with 9 parts of Cr O 'and containing one molecular proportion of Cr C) to 1 molecular proportions of H 'SO The chromium compound thus completely precipitated is removed from the liquor and converted into a form freely soluble in water by dissolving it in caustic soda solution, neutralizing the liquor with acetic acid and salting out. The

dry dyestuff is a dark blue-grey powder which dissolves in water to abluish green solution. In a bath containing. sulfuric acid it dyes wool fast bluish green tints.

Emample 8 v 14.4 parts of the dyestuff of the formula OH I HOaS- NEG obtained from diazotized"5-nitro-2-amino-1- phenol and 2- (phenyl-amino) -5-l1ydroxynaphthalene-*l-sulfonic acid are dissolved in 1500 parts of water and the solution is heated for 15 hours'in an enamelled autoclave having a stirrer to 125130 C. with addition of 9 parts of crystallized chromium sulfate containing 31.9 percent. of Cr 0 The insoluble chromium compound thus formed is filtered and converted into a form soluble in water by dissolution in caustic soda solution as described in Example 7. It is a dark blue powder, soluble in Water to a greenish blue solution and in sodium carbonate solution to a reddish blue solution. It dyes wool in an acid bath greenish blue tints, and cotton or regenerated cellulose, such as viscose silk, 'in a neutral or feebly alkaline bath also 1 greenish blue tints.

The operation of dyeing with dyestufls of this invention is illustrated by the followexamples.

E mample 9 The dye-bath is prepared with 3 per cent. of sulfuric acid of 66 B. (calculated on the weight of the goods) and wool is handled in the bath for 1015 minutes at 60 C. The thoroughly dissolved dyestufl is then added and dyeing continued for hour at 60 0.; the bath is then gradually heated to boiling, whereupon a further-5 per cent. of sulfuric acid of 66 Be. is added and boiling continued for A hour for complete development of the tint.

Example A dye-bath is prepared with 2 parts of the chroiniferous dyestufi' and parts of Glaubers salt or 30 parts of common salt. 100 parts of cotton are entered at 70 (l, the

bath or a feebly acid bath.

' Example 11 For making colored nitrocellulose varnishes there are dissolved in 1000 parts of the otherwise finished varnish 47-5 parts or the chrorniferous dyestufi'. The liquid thus 0b tained when applied in the form of a thin layer on Various supports (metalglass, leather, ceramic ware, wood celluloid, silk or the like) leaves on drying a transparent coating, the color of which is fastto light. By incorporating a suitable substance the transparent Varnish can be converted into inatt varnish or a covering varnish.

In the following table some members of the large class of dyestuffs are named with which the new chironiing process may be carried out Chromated-dyestulf No. Formula of the unchromed dyestuff Chroming agent Color of the Shade of the powder dyeing 1 OH Neutral chromium sulfate Yellow (lreenish yellow e s 0 H 1 v a I C O OH v 7 Cl N=N 2 in 0H Do Yellow orange Yellow I I I COOH N= Y 3 H 038- OH Do Dark brown Brown I tug N 02 4 HO3S- OH HO-l Do Red' brown liordeaux N;N*C 0 Basic chromium sulfate Orange Orange HO S- -0H 5 Ghromated dyestufi No. Formula of the unchroined dyestufi Chroming agent Color of the Shade of the powder dyeing N= 0 0 on, on 6 N HO- N Neutral chromium sulfate Red brown Red N=N C: C 7 OH H 0 g; Do Green black Green H c o 0 OaN OH N H:

8 Do Dark brown Brown- N 02 NH:

' --N=N 9 H O35 O11 Acid chromiumsulfate Dark brown Brown N Hz H 03s- NH- 10 I Neutral chromium sulfate Dark Violet C O OH I OH OH 7 I H O3S NH:

N O: 11 IIT=N Do Dark Green OH OH (J 0 OH H 038 NH:

12 1YI=N Do Dark Grey on 0H Whatweclaimisie containing chromium, consisting in treating 1. Process for the production of dyestufis azo-dyestufis which contain groups capable of being chromed, with basic chromium sulfates.

aZo-dyestuffs which contain in ortho-positionto at least one N=Nbridge at least one group whlch, 1n combinatlon with an N N bridge, rendersthe dyestufilcapable of binding basic chromium, with basic chromium sulfates. i

3. Process for the production of dyestuffs containing chromium, consisting in treating azo-dyestulfs; of the general formula fu-N=NR$ wherein R represents an aryl radicle, R the radicle of a coupling component, and m such a group standing in ortho-position to the N=N bridge which, in; combination with this N=Nbridge,renders the dyestufl' capable of binding basic chromium, with basic chromium sulfates.

4. Process for the production of dyestuffs containing chromium, consisting in treating azo-dyestufts' of the general formula on I I 1N =N- Riz wherein R represents an aryl the radicle of a coupling component, and the hydroxyl group of the aryl radicle R stands in ortho-position to the N=Nbridge, with basic chromium sulfates.

5. Process for the production of dyestuffs containing chromium, consisting in treating azo-dyestufisof the general formula wherein R and R represent aryl radicles,

and the hydroxyl group of the aryl radicle R stands in ortho-position to the N=N bridge, with basic chromium sulfates.

6. Process for the production of dyestuffs containing chromium, consisting in treating azo-dyestuifs of the general formula i on i 1Z1N=NR; wherein R and R represent naphthalene radicles, andj the hydrox yl group of the naphthalene radicle R stands in ortho-position to the N=Nbridge, with basic chromium sulfates.

7. Process for the production of a dyestuif containing chromium, consisting in treating the azo-dyestuff of the formula V 03H with a basic chromium sulfate.

radicle, R

"Pr-ocess'for the "production of dyestuffs containing chromium, consisting 1n treating 'azo-dyestuffsof the general formula wherein R represents an aryl radicle, the radicle of sucha coupling component of "which the carbon atom linked with the N=N'bridge belongs to a heterocyclic ring, and the hydroXyl-group of the ar'yl radicle R stands 111 ortho-position to the ;N=Nbridg'e, with basic chromium sulfates.

- I g 9. Process for the production of dyestuffs bontainingchromium, consisting in treating azo-dyestuffs of the general formula wherein R and R represent arylradicles,

and the hydroxyl group of the aryl radicle R, stands in ortho-position to the N=l l bridge, withr-basic chromium sulfates.

10. Process for the productionof a dyestuff containing; chromium, consisting in treating the azodyestufi' of the formula i V on I i I 5 1 2 NO; I

with a basic chromium sulfate. I

I 11. Process for the production of dyestuffs containingchromium, consisting in treating am-dyestuffs of the general formula iwherein R representsan 'aryl radicle, R the radicle of an aceto-acetic-acid, and the hydroxyl group of the aryl radicle Rflstands in ortho-position to the N=N- bridge, with basic chromium sulfates. Q I

l 12. Process for the production of a dyestufl' ggcontaining chromium, consisting in treating the azo-dyestufi? of the formula with a basic chromium sulfate. i

131.11 6 chromium compounds of axo-dyestuffs obtained by chroming azo dyestuffs, in

which the; groups capable of being chromed contain bound basic chromium, with basic chromium sulfates, which products form yellow to orange to red to violet to blue to green to black powders which dye the fiber yellow to orange to red to violet to blue to green to black tints. I

1 1. The chromium compounds of azo-dyestulfs obtained by chroming azo-dyestufi's, which contain in ortho-position to at least one N=N bridge at least one group which, in combination with an N=N bridge,contain bound basic chromium, with basic chromium sulfates, which products form yellow to orange to red to violet to blue to green to black powders which dye the fiber yellow to orange to red to violet to blue to green to black tints.

15. The chromium compounds of amdyestuffs of the general formula wherein R stands for an aryl radicle, R for the radiole of a coupling component, and w for a group standing in ortho-position t0 the "N=Nbridge which, in combination with this N=N*bridge, contains bound chromium, and obtained by chroming these aZo-dyestuifs, with basic chromium sulfates, which products form yellow to orange to red to violet to blue to green to black powders which dye the fiber yellow to orange to red to violet to blue to green to black tints.

16. The chromium compounds of azo-dyestuffs of the general formula wherein R and R stand for aryl radicles and the hydroxyl group standing in orthoposition to the N=Nbridge, in combination with this N=Nbridge, contains bound chromium, and obtained by chroming these azo-dyestufis, with basic chromium sulfates, which products form yellow to orange to red to violet to blue to green to black powders which dye the fiber yellow to orange to red to violet to blue to green to black tints.

mium sulfates, which products form yellow to orange to red to violet to blue to green to black powders which dye the fiber yellow to orange to red to violet to blue to green to black tints.

19. The chromium compound of the azodyestuff of the formula on I i p on SOzNHz SOaH wherein the hydroxyl group of the naphthalene nucleus containing a sulfo group, in combination with the N=Nbridge, contains bound chromium, and obtained by chroming these azo-dyestufls, with a basic chromium sulfate, which product forms a black powder dyeing the fiber greenish-blue tints. p r

20. The chromium compounds of azo-dyestufl's of the general formula I'{1-N=N-R2 (3H R1-N=NO\GOH3 HO-O U N T R3 wherein R and R stand for aryl radicles and wherein the hydroxyl group of the aryl radicle R standing in ortho-position to the N=Nbridge, in combination with this N=N -bridge, contains bound chromium, and obtained by chromium these azo-dyestuffs, with basic chromium sulfates, which products form yellow to orange to red powders which dye the'fiber yellow to orange to red tints.

22. The chromium compound of the amdyestufi of the formula H o5s N=N coon 'HO wherein the hydroxyl group of the benzene nucleus, in combination with the -N=N bridge, contains bound chromium, and obtained by chroming-this azo-dy'estufi with a basic chromium sulfate, which product forms a yellowislrorange powder dyeing the fiber yellowish-orange tints.

23. As new products the chromium compounds of azo-dyestuffs of the general formula s i 1.!{1N-=N-R2 wherein R stands for an aryl radicle, R for the radicle of an aceto-acetic acid, and wherein the hydroxyl group of the aryl radicle R standing in ortho-position to the N=N-bridge, in combination with this N=Nbridge, contains bound chromium, and obtained by chroming these azo-dyestuds, with basic chromium sulfates, which products form yellow to orange powders which dye the fiber yellow to orange tints.

2%. Thechromium compound of the azoclyestufi' of the formula wherein the hydroxyl group of the benzene nucleus, in combination with the N=N bridge, contains bound chromium, and obtained by chroming this azo-dyestuff with a basic chromium sulfate, which product forms a yellow powder dyeing the fiber yellow tints.

In witness whereof we have hereunto signed our names this 17th day of November,

FRITZ STRAUB. HANS MAYER. 

